Twice in the last seven days, Egypt and the United Arab Emirates have secretly launched airstrikes against Islamist-allied militias battling for control of Tripoli, Libya, four senior American officials said, in a major escalation of a regional power struggle set off by Arab Spring revolts.''

The United States, the officials said, was caught by surprise: Egypt and the Emirates, both close allies and military partners, acted without informing Washington, leaving the Obama administration on the sidelines. Egyptian officials explicitly denied to American diplomats that their military played any role in the operation, the officials said, in what appeared a new blow to already strained relations between Washington and Cairo.

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The United States, the officials said, was caught by surprise: Egypt and the Emirates, both close allies and military partners, acted without informing Washington, leaving the Obama administration on the sidelines. Egyptian officials explicitly denied to American diplomats that their military played any role in the operation, the officials said, in what appeared a new blow to already strained relations between Washington and Cairo.

If independent sources confirm the airport has changed hands, it would be a major defeat for the nationalist fighters from Zintan west of Tripoli who have held the airport since the fall of long-time dictator Muammar Gaddafi in 2011.